急问：天山-5-32（GWD13）

windflower560

急问 天山5-32（GWD13）

以下是引用lawyer_1在2004-7-21 5:01:00的发言：

答案为C

1。 关键在于理解UNLIKE，Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria意思为：不能造M的老鼠感染细菌时硝酸盐没有显示升高。能造M的老鼠感染细菌时硝酸盐显示升高（UNLIKE）。C选项说出硝酸盐升高的两种方式，PRODUCTION和 INHIBIT。

2。其它易排除，A较混淆。A的问题在于sufficient。怎样才算sufficient，这概念太含糊，归纳题是不允许这种含糊概念的，再说对那些造M量不足的老鼠，不见得会用其它方式抵抗细菌，难道就不允许由于M细胞不够而生病或根本没事吗。其实我一眼就不喜欢A，它不象归纳题选项，好像跟原文关系不大。感觉上新信息太多，又是some other way，又是sufficient。

我还是不能理解为什么选C,好像昨天梦里明白了，今天坐在电脑前有不明白了。

原文都说：mice that are genetically incapable of making these particular cells ，即Ｍ，C选项还在说M,C不是无关选项么？原文大概意思：不产M的mice,N不高，C.。还在说M,文章都说不产了

windflower560

这是题目

gwd-13-32

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Q32:

Macrophages are cells that play a role in the response of the immune system of mice and other mammals to invasive organisms such as bacteria.  Unlike other mice, mice that are genetically incapable of making these particular cells do not show elevated levels of nitrates when infected with bacteria.

The statements above, if true, provide the most support for which of the following conclusions?

1. Mice that are unable either to make macrophages or to make them in sufficient numbers will protect themselves from bacterial infections in some other way.
2. Mice that show elevated levels of nitrates can easily fight off most types of bacterial infections.
3. In mice, macrophages play a role in the production of nitrates or inhibit a process by which nitrates are broken down or otherwise eliminated.
4. When a healthy mouse becomes infected with an invasive organism, the number of macrophages in the mouse’s body decreases.
5. Injections of nitrates into mice that lack macrophages will not enhance the ability of these animals’ immune systems to fight off infection.

   Answer:

windflower560

怎么没有人理我？？？

windflower560

还是没有人？

版主呀，来看看吧！！

windflower560

为什么呢？？

bigmouse

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=60259

看看这里的讨论，也许对你有帮助。

另外，建议MM在提问前，在坛子里看看有没有人问过同样的问题～～

因为斑竹们都有自己的事情，挺不容易的，多体谅一下他们，你说呢？

windflower560

唉,我就是看了所有关于这题的讨论人仍不懂才问的,而且是在那边贴了没人理,才有贴到这里的.

好的,知道了.